Ganglioside inhibit the antigen-presenting capability of epidermal Langerhans cells / 中国免疫学杂志

ABSTRACT

Objective:To study whether gangliosides inhibit the antigen-presenting capability of epidermal Langerhans cells.Methods:In the vitro test, the purified Langerhans cells were exposed to increasing concentration of gangliosides for 5 hours at 37℃,then KLH was added and incubated for 2 hours at 37℃.At last we added HDK1 and after 72 hours of coculture, levels of IFN-? in culture supernatants were measured by ELISA. In the vivo test, immunity to the S1509a spindle cell carcinoma was induced by s.c. inoculation at weekly intervals into naive syngeneic(CAF1) for a total of three immunizations. Delayed-type hypersensitivity(DTH) was elicited 1 week after the last immunization by injection a hind footpad with TAA-pulsed Langerhans cells incubated with or without gangliosides. Footpad swelling was assessed at 24 and 48 hours with a spring-loaded engineer′s micrometer.Results:The presence of gangliosides during HDK1 activation reduced the expression of IFN-? in vitro test. Gangliosides suppressed Langerhans cells to elicit DTH against TAA in vivo test.Conclusion:Ganglioside inhibit the antigen-presenting capability of epidermal Langerhans cells.